This conversation makes me think of a poem my mother taught me when I was a kid. As best I can recall it went:

Here lies the grave of Mike O'Day
who died defending his right of way.
His right was clear and his will was strong,
but he's just as dead as if he'd been wrong.

I find that pulling my canoe on its trailer with a flag makes drivers pay more attention and take fewer risks when passing me. Perhaps because its different than what they expect to see so it jogs their minds a bit, or maybe it's something else.
Zach